| Carlowrightia sinaloensis Leonard & Gentry, 1948 |
| Carlowrightia texana Henrickson & T.F. Daniel, 1979 |
| Carlowrightia torreyana Wassh., 1965 |
| Carlowrightia trichocarpa T.F. Daniel, 1983 |
| Carlowrightia venturae T.F. Daniel, 2003 |
| Chaetothylax Nees, 1847 |
| Chaetothylax rzedowskii Acosta, 1989 |
| Chalarothyrsus Lindau, 1904 |
| Chalarothyrsus amplexicaulis Lindau, 1904 |
| Chileranthemum Oerst., 1855 |
| Chileranthemum lottiae T.F. Daniel, 1993 |
| Chileranthemum pyramidatum (Lindau) T.F. Daniel, 1995 |
| Chileranthemum trifidum Oerst., 1855 |
| Chileranthemum violaceum Miranda, 1951 |
| Crossandra Salisb., 1805 |
| Crossandra fascicularis Benth., 1839 |
| Crossandra haenkeana Nees, 1847 |
| Cryphiacanthus Nees, 1841 |
| Cryphiacanthus lacteus (Cav.) Nees, 1847 |
| Cryphiacanthus lacteus var. acaulis Nees, 1847 |